CN112543090A - Non-orthogonal-based uplink relay full-duplex transmission mechanism model - Google Patents
Non-orthogonal-based uplink relay full-duplex transmission mechanism model Download PDFInfo
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L5/00—Arrangements affording multiple use of the transmission path
- H04L5/14—Two-way operation using the same type of signal, i.e. duplex
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
- H04W24/00—Supervisory, monitoring or testing arrangements
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04W—WIRELESS COMMUNICATION NETWORKS
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Abstract
The invention discloses a non-orthogonal uplink relay full duplex transmission mechanism model, which specifically comprises the following steps of: uplink user 1 and user 2 allocate transmission power using self-generated to relay channel conditions
And
wherein
，
(ii) a FalseIt is determined that both users cannot directly communicate with the base station, and therefore, cooperative transmission of the relay station is required; without loss of generality, it is also assumed that user 1 is closer to the relay than user 2. The relay station is a full-duplex antenna and can implement full-duplex transmission. Compared with the traditional uplink relay semi-duplex transmission mechanism, the uplink relay full-duplex transmission mechanism based on the non-orthogonal multiple access technology provided by the invention obtains better traversal capacity communication performance.
Description
Technical Field
The invention relates to a wireless communication transmission technology, in particular to a continuous interference elimination technology in a non-orthogonal multiple access technology, a self-interference elimination technology in full-duplex communication and a decoding forwarding transmission protocol in relay communication.
Background
The traditional uplink relay transmission is based on a half-duplex communication mode, and with the rapid development of an integrated circuit technology and a signal processing technology, the self-interference caused by full-duplex communication can be effectively inhibited, so that the implementation of the full-duplex communication becomes possible. The non-orthogonal multiple access technology adopts power domain differential power distribution, superposition coding and continuous interference elimination technology, so that better communication performance compared with the orthogonal multiple access technology is received.
The invention provides an uplink relay full-duplex transmission mechanism model based on non-orthogonality, which is based on the combination of a non-orthogonal multiple access technology and a full-duplex communication transmission technology and aims to effectively improve the spectrum efficiency.
Disclosure of Invention
The invention provides a non-orthogonal uplink relay full-duplex transmission mechanism model aiming at the problem of low spectrum efficiency in the traditional half-duplex uplink relay transmission mode.
The technical scheme of the invention is as follows: a non-orthogonal uplink relay full duplex transmission mechanism model is disclosed, which comprises the following steps:
uplink user 1 and user 2 allocate transmission power beta using self-generated to relay channel condition1PtAnd beta2PtWherein beta is1+β2＝1，β1＞β2. It is assumed that neither user can communicate directly with the base station and, therefore, cooperative transmission by the relay station is required. Without loss of generality, it is also assumed that user 1 is closer to the relay than user 2.
The relay station is a full duplex antenna and thus can perform full duplex transmission. The two user signals received by the receiving end of the full-duplex antenna from the uplink can be represented as:
wherein h is1r[n]、h2r[n]And hr[n]Respectively representing user 1 and relay, user 2 and relay and self-interference channel coefficients. All channels are assumed to be subject to rayleigh fading channels. N is a radical ofr[n]Is white gaussian noise received by the relay station. s1[n]And s2[n]For signals transmitted by two uplink users. s1[n-τ]And s2[n-τ]Indicating successfully decoded user 1 and user 2 signals transmitted by the transmitting end of the full duplex antenna of the relay station.
The signal received at the uplink base station can be expressed as:
wherein h isrb[n]Representing the channel coefficient, N, of the relay to the base stationb[n]Representing white gaussian noise received by the base station. The base station first takes the signal 2 as interference, decodes the signal 1, and then rejects the signal 1 by using the successive interference cancellation technique, and successfully decodes the signal 2.
In the transmission scheme provided by the invention, the sending end of the full-duplex antenna does not transmit any information in the first tau transmission time slots of the relay station, and the receiving end of the full-duplex antenna does not have self-interference in the first tau transmission time slots. The full duplex antenna receiving end decodes the information of the uplink users 1 and 2 by using successive interference cancellation. After the first tau transmission time slots, the sending end of the full duplex antenna transmits two pieces of user information which are successfully decoded by the receiving end by using superposition coding technology. At this time, the full-duplex antenna receiving end receives self-interference caused by the transmitting end, and the full-duplex antenna receiving end reduces and eliminates the self-interference by using a self-interference elimination technology. In the transmission mechanism, full-duplex communication is adopted after tau transmission time slots, and the transmission communication performance gain is better compared with that of a half-duplex relay transmission mechanism.
Drawings
Fig. 1 is a schematic diagram of a transmission mechanism model of the present invention.
Fig. 2 is a schematic diagram illustrating a comparison between the transmission scheme of the present invention and the conventional uplink relay semi-duplex transmission scheme based on traversal capacity communication performance.
Detailed Description
As shown in fig. 1, a non-orthogonal uplink relay full duplex transmission scheme model includes the following steps:
uplink user 1 and user 2 allocate transmission power beta using self-generated to relay channel condition1PtAnd beta2PtWherein beta is1+β2＝1，β1＞β2. It is assumed that neither user can communicate directly with the base station and, therefore, cooperative transmission by the relay station is required. Without loss of generality, it is also assumed that user 1 is closer to the relay than user 2.
The relay station is a full duplex antenna and thus can perform full duplex transmission. The two user signals received by the receiving end of the full-duplex antenna from the uplink can be represented as:
wherein h is1r[n]、h2r[n]And hr[n]Respectively representing user 1 and relay, user 2 and relay and self-interference channel coefficients. All channels are assumed to be subject to rayleigh fading channels. N is a radical ofr[n]Is white gaussian noise received by the relay station. s1[n]And s2[n]For signals transmitted by two uplink users. s1[n-τ]And s2[n-τ]Indicating successfully decoded user 1 and user 2 signals transmitted by the transmitting end of the full duplex antenna of the relay station.
The signal received at the uplink base station can be expressed as:
wherein h isrb[n]Representing the channel coefficient, N, of the relay to the base stationb[n]Representing white gaussian noise received by the base station. The base station first takes the signal 2 as interference, decodes the signal 1, and then rejects the signal 1 by using the successive interference cancellation technique, and successfully decodes the signal 2.
As shown in fig. 2: compared with other traditional uplink relay semi-duplex transmission mechanisms, the uplink relay full-duplex transmission mechanism based on the non-orthogonal multiple access technology provided by the invention has better traversal capacity communication performance. Especially when the residual self-interference level is small. This also shows that the performance of the transmission scheme proposed in this patent depends mainly on whether the self-interference signal caused by full-duplex communication can be effectively controlled.
Claims (1)
1. A non-orthogonal-based uplink relay full-duplex transmission mechanism model is characterized in that: the steps of the transmission are specifically as follows:
uplink user 1 and user 2 allocate transmission power beta using self-generated to relay channel condition1PtAnd beta2PtWherein beta is1+β2＝1，β1＞β2(ii) a It is assumed that neither user can directly communicate with the base station, and thus, cooperative transmission of the relay station is required; without loss of generality, in addition, it is also assumed that user 1 is closer to the relay than user 2; the relay station is a full-duplex antenna and can implement full-duplex transmission;
two user signals from the uplink received by the receiving end of the full-duplex antenna are represented as:
wherein h is1r[n]、h2r[n]And hr[n]Respectively representing user 1 and relay, user 2 and relay and self-interference channel coefficients; assuming that all channels are subject to rayleigh fading channels; n is a radical ofr[n]Received for a relay stationWhite gaussian noise; s1[n]And s2[n]Signals transmitted for two uplink users; s1[n-τ]And s2[n-τ]Indicating successfully decoded user 1 and user 2 signals sent by a full duplex antenna sending end of the relay station;
the signal received at the uplink base station can be expressed as:
wherein h isrb[n]Representing the channel coefficient, N, of the relay to the base stationb[n]Representing white gaussian noise received by the base station; in addition, α1And alpha2The power distribution coefficient distributed by the relay full-duplex antenna sending end for the information transmission of the user 1 and the user 2 is represented; the base station first takes the signal 2 as interference, decodes the signal 1, and then rejects the signal 1 by using the successive interference cancellation technique, and successfully decodes the signal 2.
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114143796A (en) * | 2021-10-14 | 2022-03-04 | 河海大学 | Method for signal transmission performance in uplink |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109743768A (en) * | 2018-12-26 | 2019-05-10 | 南京邮电大学 | Bi-directional relaying communication plan based on non-orthogonal multiple access technology |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109743768A (en) * | 2018-12-26 | 2019-05-10 | 南京邮电大学 | Bi-directional relaying communication plan based on non-orthogonal multiple access technology |
Non-Patent Citations (1)
| Title |
|---|
| XIANBIN XIE ET AL: ""Ergodic Capacity and Outage Performance Analysis of Uplink Full-Duplex Cooperative NOMA System"", 《IEEE ACCESS》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114143796A (en) * | 2021-10-14 | 2022-03-04 | 河海大学 | Method for signal transmission performance in uplink |
| CN114143796B (en) * | 2021-10-14 | 2024-05-14 | 河海大学 | Method for signal transmission performance in uplink |
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Application publication date: 20210323 |